<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
//用try-catch
try {
    let s = '{username: "zs"}'
    let o = JSON.parse(s)
}catch(e){
    // console.log(e)
    console.error(e)
}

console.log(123)
</script>
</html>